Form for concrete columns



C. H. HOPMANN.

FORM FOR CONCRETE COLUMNS. APPLICATION FILED mm I6, 1922.

Patented Sept. 26, 1922,

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sisters series.

CHARLES E. HOPMAN'N, ST. LOUIS, MISSOURI.

FORM FOR CONCRETE COLUMNS.

Application. filed January 16, 1922. Serial No. 529,593.

To {LZZ 107mm it may concern.

Be it known that 1, Queens H. IlOl 1i; .NN, a citizen of the United States, and resident of the city of St. Louis and State oi Missouri, have invented certain new useful improvements in Forms for (Jon crete Columns, oit which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to certain new and useful iniprorem t in tornisior. ctn'icrete columns and the like, and has tor its primary object the construction of a form which may be made in any number, size, and. shape of" sections. and provided with means for securely fastening the sections together.

In the drawings,

Fig. 1 is a side elevation of my improve ment with parts of the sections broken away.

Fig. 2 an enlarged section taken on the line 22 of Fig. 1, looking in the direction 01' the arrows.

Fig. 3 a fragment-a1 sectional view, showing the manner of securing the stiii'ening bands to the sections.

Fig. a 'i'raginental sectional view. illustrating the manner of fastening the sections together.

Fig. an inside view oi one of the clips for holdii'ig the sections in assembled form; and

Fig. 0 a tragniental view of the stil'teuing bands, and how they may be tightened on the sections.

Referring to the drawings- 7 indicates one of the sections oi iny im proved form which is made of any size, shape of suitable material. In the form shown the sections are cylindrical and have free ends 8 and 9, and when secured in assembled form, the edge 9 overlaps the edge 8. so as to make a tight seam. Secured to the end 8 by means of rivets 10 is a dove-tailed strip 11, and secured to the end 9 by means of rivets 12 is a dove-tailed strip These dove-tailed strips are on the outside of the sections, and by means of clips let, the sections are secured together along their free ends. The inside view of one of the clips for this purpose is illustrated in Fig. 5.

These clips are made out of metal and may be applied by inserting the same over the ends of the d0vetailed strips 11 and 13,

as illustrated in Fig. 2. They also maybe removed from the dove-tailed strips for the purpose of opening up the sections and removing them from the work. Mounted on the ends or" the sections 7 are stii'lening bands 15 formed preferably as illustrated out of t-iron. These bands encircle the ends of the sections, and are formed in sections, and as illustrated, each band consists of two sections, such as 16 and 17. The band 16 is provided with holes 18 adjacent its ends and intermediate holes l9.

In Figs. L and 2 I have shown'the hand located on the upper section and also the band located on the upper end of thesection 7., The band located on the upper end of the section 7 is "formed of two pieces, such as 16 and 17, and is likewise provided with holes. The holes in the band located on the upper end 01" section 7, being slightly ofifset to the holes formed in the band located on the lower end oi the upper section. This offset arrangement of the holes in the adja cent bands being illustrated in Fig. 6.

20 indicates pins which are inserted through the holes 18, and through the holes in the adjacent band. By driving these pins home the sections of the stiffening ribs are drawn tightly around the form sections. litter the form sections have been secured together by means of the clips M, and the stiffening bands 15 secured to the ends thereof, the next operation in assembling the form is to secure the different sections oi the forms together.

In Fig. d T have illustrated the manner ct securing the di'li'erent i orn'l sections to gether. This locking arrangement coinprises a yoke 21 secured adjacent the lever end of one of the form sections, and a yoke 22 secured adjacent to the top end ot the adjacent 'iorni section. Located in the yoke 21 is a pin 23, and located in the yoke 22 is a tapered or wedge shaped. pin 24.

25 indicates a locking pin or bar having formed in its upper portion an opening 26 to receive the pin 23, and in its lower portion an opening 27 to receive the wedge shaped .rey 24. By driving in the pin 24 its inclined face will exert a downward pull on the locking bar 25, and will consequently draw the ends of the adjacent form sections tightly together. he pins 26 as previously referred to, not only hold the stiffening bands to the form sections and tighten the same around the form sections, but also prevent one form section shifting relative to the other section. v

In Fig. 1 I have also illustrated the top form section, or What may be termed the cap section. This section is constructed like the other form sections, except that the dovetailed strips 11 and 13 are cut away, as at 28 to permit the removal of the clips 14:.

It Will be observed from the foregoing that my improved form may be made out of any number, size, or shape of form sections; that the free ends of each section, that is to say, Where they are split for removal from the Work, may be firmly secured together and detached, and that I provide a detachable means for stiffening the adjacent ends or" the sections, and to hold them in alinement; and further, that I have provided an improved locking device, simple and effective, for holding the sections together and forn'iing a tight joint.

Having fully described my invention, What I claim is:

1. A concrete form comprising a split section, having its ends overlapping, dove tailed strips secured along the overlapping portions, clips for holding the sections in shape, sectional and detachable stiffening bands for the sections, means for tightening the bands on the sections and prevent lateral shifting of one form section relative to the other, and a locking mechanism comprising a Wedge for fastening the ends of the sections to each other.

2. A concrete form comprising a serlesot' split sections, a dove-tailed strip secured adjacent the free ends of said sections, clips adapted to embrace said dove-tailed strips for holding the sections together in assembled form, sectional stifiening bands located on the adjacent ends of each section, means for tightening the sections of the bands around the sections, and to prevent one sec tion shifting laterally relative to the other section, yokes secured to the form sections, a locking bar mounted in the yokes, and means for shifting the locking bar in relation to said yokes for tightening the sec tions together.

In testimony whereof, I have signed my name to this specification.

CHARLES H. HOPMANN. 

